Walmart.com has select single CAP Barbell Cast Iron Hex Dumbbell (various weights) on sale from as low as $7.48. Select free in-store pickup to save on shipping, otherwise shipping is $4.97 or get free shipping on $50 or more.

• Available Weights
  • 10-Pounds $7.48
  • 15-Pounds $11.48
  • 20-Pounds $14.96
  • 25-Pounds $18.01
  • 30-Pounds $23.97
  • 35-Pounds $27.97
  • 40-Pounds $29.97

Alternatively, Amazon has a few of the sizes of CAP Barbell Cast Iron Hex Dumbbell on sale. Shipping is free with Prime or if you spend $49 or more.

• Available Weights
  • 35-Pounds $27.99
  • 40-Pounds $29.97
  • 70-Pounds $59.28